By default, Claude Code starts acting the moment you finish talking. For changing a button color, that's fine. But say "add a categories feature" and it might touch 4 files and change the data format, and by the time you look up you can't follow it anymore.

Plan mode is the other way: it only reads the code, thinks through an approach, and writes it out for you to see, without changing a single line. You read it, nod, and then it executes.

进入方式：在输入框按 Shift+Tab 切换模式，切到「plan」；或者直接说：

「先别改代码。给我一个方案：加分类功能会动哪些文件、数据怎么存、空分类和重名分类怎么处理、做完怎么验证。」